chore: add tests for sort transform

gka · gka · commit 22804c0b4877 · 2025-05-31T20:56:58.000+02:00
diff --git a/src/lib/transforms/sort.test.ts b/src/lib/transforms/sort.test.ts
@@ -0,0 +1,45 @@
+import { describe, it, expect } from 'vitest';
+import { sort } from './sort.js';
+import type { DataRecord } from '$lib/types.js';
+
+const data: DataRecord[] = [
+    { A: 1, B: 7 },
+    { A: 5, B: 4 },
+    { A: 3, B: 3 }
+];
+
+const sortedByA = data.sort((a, b) => a.A - b.A);
+
+describe('sort transform', () => {
+    it('does not sort if no sort channel is defined', () => {
+        expect(sort({ data }).data).toStrictEqual(data);
+    });
+
+    it('sort data by string accessor', () => {
+        expect(sort({ data, sort: 'A' }).data).toStrictEqual(sortedByA);
+    });
+
+    it('sort data by accessor function', () => {
+        expect(sort({ data, sort: (d) => d.A }).data).toStrictEqual(sortedByA);
+    });
+
+    it('sort data by comperator function', () => {
+        expect(sort({ data, sort: (a, b) => a.A - b.A }).data).toStrictEqual(sortedByA);
+    });
+
+    it('sort data by channel', () => {
+        expect(sort({ data, x: 'A', sort: { channel: 'x' } }).data).toStrictEqual(sortedByA);
+    });
+
+    it('sort data by channel descending', () => {
+        expect(
+            sort({ data, x: 'A', sort: { channel: 'x', order: 'descending' } }).data
+        ).toStrictEqual(sortedByA.toReversed());
+    });
+
+    it('sort data by channel descending alternative syntax', () => {
+        expect(sort({ data, y: 'A', sort: { channel: '-y' } }).data).toStrictEqual(
+            sortedByA.toReversed()
+        );
+    });
+});
